Process of making waterproofing for concrete and the product thereby produced



Patent Oct. 23, 1923.

. I T E D S SPENCER B. NEWBERRY, OE CLEIIELAND,

OFFICE.

OHIO; ANDREW W. NEWBERRY EXECUTOR OE SAID SPENCER B. NEWBERRY, DECEASED, ASSIGNOR TO MEDUSA CONCRETE WATERPROOFING COMPANY, OF CLEVELAND, OHIO, A. CORPORATION OF MAINE.

PROCESS OF MAKING WATERPROOFING FOR CONCRETE AND THE PRODUCT THEREBY PRODUCED.

No Drawing.

To all whom it may concern:

Beit known that I, SPENCER B. Nnw- BERRY, a citizen of the United States, and resident of Cleveland, county of Cuyahoga, State of Ohio, have invented certain new and useful Improvements in Processes of Making Waterproofing for Concrete and the Product Thereby Produced, of which the following is a specification.

This invention relates to a process for making waterproofing for concrete and the product thereby produced. It is designed to more perfectl prevent the penetration of water into t e concrete through surface voids or pores than has been possible by coatings heretofore used. The novel fea tures will be understood from the following description and claims.

Integral waterproofing for rendering ooment concrete impervious to water is commonly made, as described in Patent No.

851,247, issued to me April 7 1907 by combining fatty acids with lime by heat and grinding fatty aclds to fine powder. The degree of waterproofing effect produced by the material depends to a eat extent on its fineness of subdivision, since the function of the waterproofing is to coat the surfaces of the so voids or pores of the concrete and to exert a water-repellent action which prevents absorption or penetration of water into the mass. The method of preparation of the waterproofing commonly employed is to melt the fatty acid by heat and to stir in sufiicient lime to bring the fatty acid into complete combination, then after cooling, to

'nd the solid lime compound, with the addition of a further quantity of lime in hydrated form, to fine owder. Another method, as described in atent No. 851,247,

is to slake quick lime and add fatty acid,

thus efiecting the combination by the heat of the slakin of the lime, and finally to as dry and grin the product.

Along series of careful tests have demonstrated that the emplo ent of heat in combining fatty acids wit lime greatly injures the water-re ellent efiect o the product,

and that if t is combination takes place in the cold, that is without sensible rise in temperature above that of the atmosphere, a

product of almost molecular fineness, pos- Application filed July 2,

the resulting lime compound'of 1921. SerialNo. 482.253.

sessing waterproofing qualities far beyond those of any materials hitherto known, is obtained. If two blocks of concrete are prepared, one containing the best waterproofing now on the market, and the other a waterproofin of the same composition but prepared (y the cold method, the latter will be foun to absorb only one-fourth to onethird as much water as the former. This marked difference is doubtless largely due to the extreme fineness of the cold-prepared material, afineness which it is practically impossible to reach by any method of grinding in the case of waterproofing prepared by a process in which heat, even as hi has the boiling point of water, is empIoyed. Even with equal fineness it will be. found that waterproofing containing fatty acids is greatl injured in its water-repellent qualities y exposure to very moderate heat, and that greatly superior water-repellent qualities are possessed by a compound which has not been exposed to a temperature greatly exceeding that of the'atmosphere.

The method of making the fatty acid compound without the use of heat, which I have found most economical and efiicient, is to bring the fatty acid, in lum or liquid form, into contact with hydrated ime and to subject the mixed materials to a stirring or grinding operation. I prefer to use solid fatty acid, known as stearic acid, but containing also palmitic and oleic acids, but commercial red oil, consisting chiefly of oleic acid, may also successfully be employed.

When the fatt acids come into contact with the lime com ination takes place at once without noticeable rise. in temperature, with the formation of a lime compound in almost infinitely fine subdivision. The only grinding action necessary therefore, is one which will detach from the lumps or masses of fatty acid the coating of lime compound formed on them, and thus bring the surfaces of fatty acid into contact with fresh portions of lime, until all the materials arefully combined and disintegrated. Prolonged agitation in a pug-mill will accomplish this result; but I have found that time is saved and the cost of the operation reduced by use of a swing-hammer or impact fiulverizer of the well known Williams or aymond type, combined with an air separator. A tube mill, with or without air separation, may also be used. lihe fineness of the product should besuch that at least 95 per cent will pass a 200 mesh sieve. By careful manufacture it is possible to reach such fineness that practically 100 per cent .will pass 200 mesh.

In place of hydrated lime, any other calcium compound which will combine with fatty acids and will not evolve sensible heat,

when treated with water, may be used. Such compounds of calcium are the basic silicates and aluminates which are the principal constituents of hydraulic cement. Waterproofing compound which falls within the scope of this application may therefore be made by mixing fatty acids with Portland or natural cement and stirring or grinding the mixture till a homogeneous, finely-db vided product is obtained.

What ll claim as new and desire to secure. by Letters Patent is- 1. Process of making waterproofing by mixing fatty acid with hydrated lime and stirring the mixture without heating it above ordinary atmospheric temperature, until the product becomes a homogeneous finely-divided powder.

2. Process of making waterproofing by mixing fatty acid with hydrated lime and pulverizing the mixture without heating it above ordinary atmospheric temperature, to an impalpable powder. v

3. Process of making waterproofing by mixing 10 to 25 parts fatty acid with 100 parts hydrated lime and pulverizing the mixture, without heating it above ordinary atmospheric temperature, to an impalpable powder. 4

4. Process of mahng waterproofing by mixing fatty acid with hydrated lime and pulverizing the mixture, without heating it above 212 degrees F, to an impalpable pow- 5. A waterproofing powder consisting of fatty acids and hydrated lime in combination and fine subdivision, which at no stage of its manufacture has been heated above ordinar atmospheric temperature. a

l 6. g waterproofing powder consisting of fatty acids and hydrated lime in combination and fine subdivision, which at no stage of its manufacture has been heated above 212 degreeslF. r

7. Process of making waterproofing by mixing fatty acid with basic calcium compounds which do not evolve sensible heat on treating with water, and pulverizing the mixture without heating it above the ordinary atmospheric temperature, to an impalpable powder.

8. Process of making waterproofing by mixing fatty acid with basic calcium compounds which do not evolve sensible heat on treating with water, and pulverizing the mixture without heating it above 212 degrees F, to an impalpable powder.

lln testimony whereof ll hereunto afiix my signature.

SPENCER B. NEWBERRY. 

